Annotations are color coded. Green have the same function and position as the Arduino UNO R3. Red are differences, where the functionality has moved on Mega2560 compared to UNO. In general, this means that the UNO put several functions on one pin and these have moved to separate pins on the Mega. Blue is for differences due to added functionality (extra pins).

I find it convenient to use the GND pins near to the analog input pins as analog grounds, and to use the GND on the end block for digital grounds, when linking to external circuitry.

Wow that's great job! Thanks for sharing! I wish I found this picture yesterday when I was trying to figure out why my clock and wave shield didn't work when I moved it from Unto to 2560 It safe me hours! I'm going to print it out and keep at my desk.That's interesting that there are 2 more I2C connections (unlabeled on the board) above AREF, I thought they weren't connected anywhere. I wonder if one above IOREF does something too?

spcomputing

Newbie alert: So which are d0-d7 lines as you would use for say LiquidCrystal()?

Thanks, K..

They are the same as a UNO unless you have a real SPI interface on the LCD. The current Arduino IDE is default to 4-bit, but if you want to use 8-bit, you will have to specify it in the initialization parameters (LiquidCrystal lcd(rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7)).

Check the out the LiquidCrystal tutorial for more detail:http://arduino.cc/en/Reference/LiquidCrystalConstructor

Also, for a lot of LCD Shields, the 4-bit initialization is different than the tutorial/examples (i.e. LiquidCrystal lcd(8, 9, 4, 5, 6, 7)

jeffmorris

I got confused by the photo of the Arduino Mega 2560 board with labeled pins. I think that the two pins at the top of the double header over pins 22 and 23 on the right side of the board are 5V pins. Are pins 23, 25, 27, and 29 digital pins? The labels on the photo confused me into thinking that pins 23, 25, 27, and 29 are 5V pins.

I have the (reference to company selling counterfeit product removed by moderator) board too I found it's best to print the schematic to see which pins and ports that where extened to the stackable connector. Im using 6 external interrrupts on mine Don